Kids whose mothers had an autoimmune disease were more likely to develop attention-deficit/hyperactivity disorder (ADHD), according to results of a cohort study and meta-analysis. Mothers with an autoimmune disease were 30% more likely to have a child with ADHD (hazard ratio 1.30, 95% CI 1.15-1.46), reported Timothy Nielsen, MPH, of the University of Sydney in Australia, and colleagues.